About every muzzleloader I have had and thats been 4 have changed POI at 100yards and 150yards after taking out of the stocks and cleaning them. Does anyone else see this. I have a T/C hawken, Knight disc elite, knight wolverine, and traditions sidelock. I can't seem to keep them assembled (in stock) and get a good cleaning. The POI change is only like 2"-3", but its more than I want.